Multi-modal Polymer Tire Composition Balancing Traction and Wear
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Solution Overview
Problem
Conventional tire component polymers often face a trade-off between traction, tread wear, and rolling resistance, where optimizing one property typically leads to a decline in others, necessitating the use of polymer blends to balance these properties.
Innovation Solution
A vulcanizable composition featuring a multi-modal polymer with distinct peak molecular weights within a specific range, characterized by a Gel Permeation Chromatography curve with multiple peaks, is developed, allowing for improved wear resistance and crack growth resistance in tire components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single molecular weight polymer is used to optimize one tire property (e.g., traction), then that property improves but other properties (e.g., tread wear, rolling resistance) deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the polymer into multiple molecular weight segments within a controlled range (50-200 kg/mol). This creates a multi-modal distribution where different molecular weight segments contribute differently to various tire properties, allowing simultaneous optimization of traction, tread wear, and rolling resistance without requiring complex polymer blends.
2Reliability
If polymer blends are used to balance multiple tire properties, then property balance improves but formulation complexity increases
Solution Approach 1:
The patent changes the molecular weight parameter distribution within a single polymer type rather than blending different polymer types. By controlling the molecular weight distribution to have a specific range (50-200 kg/mol) with appropriate polydispersity, the patent achieves balanced tire properties while maintaining simpler formulation and processing compared to traditional polymer blends.
Data Source
AI summary
A vulcanizable composition of matter comprising a rubber component, a filler, a curative for the rubber, where the rubber component includes a multi-modal polymer including at least two distinct peak molecular weights within a range defined by a lower limit of 80 kg/mole and an upper limit of 500 kg/mole.